Abstract
Vanillic acid has received remarkable attention due to its diversified applications in cosmetics, food, flavours, tobacco, pharma, alcohols, beverages, and polymer industries. However, its separation from fermentation broths and wastewater of olive oil mills, or paper and pulp industries is still a problematic process. In this paper, the liquid – liquid extraction has been investigated for the separation of vanillic acid from aqueous streams. The assessment of equilibrium has been done by calculating the partition coefficient, dimerization constant, distribution coefficient, and extraction efficiency. The extraction ability is given in terms of extraction efficiency and distribution coefficient followed a trend:1-octanol (54.07%) > iso-butanol (51.73%) > toluene (45.23%) > xylenes mix (35.47%) > petroleum ether (31.54%) > benzene (30.44%). The obtained results were discussed with help of acid properties, type of solvent used, and their physicochemical properties such as dipole moment ( D m ), dielectric constant ( ε ), solvent polarity parameter ( E T ), solubility in water, octanol-water partition coefficient ( log K ow ), etc. This is the first attempt of study using the extractive separation method for removal or recovery of vanillic acid from aqueous solutions by the above-mentioned solvents.
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